Steam-engine governor



(No Model.) 2 lSheets-Sheet 1.

f E. L. MILLS.

STEAM ENGINE GOVERNOR. No. 485,817. Patented Nov. 8, `189.2.

mf j NNN WWA/5555s. /NvE/vron 36 l 'wa yf z'ZZ:

2%/ @mi BY www Afro/mfr.

(No Model.) 2 Sheets-Sheet 2.

L. L. MILLS.

STEAM ENGINE GOVERNOR.

No. 485,817. Patented Nov. 8, 1892.

W/TNESSIE'S: INVENTOH NiTnn STATES PATENT UFFICI-3.

EDWARD L. MILLS, OF ERIE, PENNSYLVANIA.

STEAM-ENGINE -GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 485,817, dated November8, 1892.

Application filed May 18, 1892.

nia, have invented certain new and useful Improvements in Steam-EngineGovernors, and I do hereby declare the following to be a full, clear,and exact description of the invention,such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to the letters ofreference marked thereon, forming part of this specification.

My invention consists in the improvements in steam-engine governorshereinafter set forth'and described, and illustrated in the accompanyingdrawings, in which- Figure 1 is a View in elevation of my improved steamengine governor when the eccentric-pin thereof is in position to producethe greatest possible movement of the valve. Fig. 2 is a verticalcentral section of same, some of the parts thereof being shown inelevation. Fig. 3 is a view in elevation of my improved steam-enginegovernor when the eccentric-pin is in position to produce approximatelythe shortest movement of the valve.

The object of my invention is to construct a steam-engine governoradapted to be placed within the driving or balance wheel on the mainshaft of the engine in which the governing mechanism consists of twopendulumlevers, one of which supports an eccentric or eccentric-pin foroperating a valve-rod, said pendulum -levers havingcentrifugally-operating Weights and centripetally operating springssecured to the farther ends thereof and being so coupled together as tobe actuated and in unison by'the centrifugal and centripetal forcesacting thereon, as is usual in the type of steam-engine governors knownas shaft-governors.

In the construction of my improved steamengine governor illustrated inthe drawings, A is the driving or balance wheel of a steamengine, and Bthe main engine-shaft.

To bosses C and C on opposite arms of the wheel A, I pivot the ends ofthe pendulumlevers D and D', the free ends d and d of said leversextending toward and across the Serial No. 433,466. (No model.)

hub A of the wheel A and the engine-shaft VB, secured therein, so as tolap by each other for some distance, as illustrated in Figs. l and 3.

On the bar D, somewhat above the center of the main shaft B, I secure alug L, which projects laterally therefronnso as to extend some distanceover the lever D', and in this lug L, I secure a wrist-pin N, adapted toreceive and actuate an eccentric rod. (Not shown.) To the ends d and flof the levers D and D' are secured Weights E and E', preferably by meansof eyebolts e and e', and in the eyes of the bolts c and e are pivotedspring-rods F F', which pass through slotted openingsfandf in the leversD and D and connect with the ends of spiral springs G and G', at whichpoint collars gand g' are secured thereto, which operate as stops tolimit the outward movement of the free ends d and d of the levers D andD. The outer ends of the springs G and G' are secured to rods H andI-I', the outer ends of which rods are secured in holes in the rim ofthe wheel A, the inner ends h and h thereof being screwthreaded, so thatby rotating them the tension of the springs G and G' can be adjusted asdesired. To the pivoted ends of the levers D and D are securedlaterally-projecting arms I and I', between the outer ends of which armsis pivoted a connecting-rod J, which operates to synchronize themovements of the levers D and D'.

In operation the tension of the springs G and G are adjusted so that ata given speed of rotation of the wheel A the centrifugal force acting onthe weights E and E will exactly counterbalance the centripetal force ofthe springs G and G', the location of the lug L and the wrist-pinNtherein being such that when the wheel A is at rest and the levers Dand D are in contact, as shown in Fig. l, the wrist-pin N is farthestfrom the center a. of the shaft B and is adapted in that position tomove the valve to its extreme traverse. When, however, the wheelA isrunning at such speed thatthe centrifugal force acting on the Weights Eand E sufficiently overcomes the centripetal force of the springs G andG', so that the free ends d and d of the levers D andD' are moved apartthereby, as illustrated in IOO Fig 3, until the levers D and Dcontactwith the stops g and g on the rods F and F', then the Wrist-pin N is atits nearest point of approach to the @entera of the shaft B,andconsequently it moves the valve its shortest traverse. Thus an increaseof the speed of the Wheel A operates Vto shorten the traverse of thevalve and a decrease of the speed thereof to lengthen the traverse ofthe valve, so that the steam is automatically cut off by the movement ofthe valve at such point as may be required, the same being regulated bythe lncrease or the decrease ot' the speed of the Wheel A above or belowthe normal speed at which it is adjusted to run.

Having thus fully described my invention, so as to enable others toconstruct and operate the same, what I claim as new, and desire tosecure by Letters Patent of the United States, is

l. The combination, in a steam-engine governor, of pendulum-levers, oneof which supports a Wrist-pin or eccentric for driving an eccentric-rod,and a rod connecting` said bars so as to synchronize the movementsthereof, with centrifugally-operating Weights and centrlpetally-actingsprings secured to the free ends of said levers, substantially as andfor the purpose set forth.

2. The combination, in asteam-engine governor, of two pendulum-levers,one of which supports a Wrist-pin or eccentric for driving an eccentricrod, with laterally projecting arms on said pendulum-levers and a rodextending from the arm on one lever to the arm onthe other lever,substantially as and for the purpose set forth.

3. The combination, in a steam-engine governor, of two pendulum-levers,one of which supports a Wrist-pin or eccentric for driving an eccentricrod, and laterally projecting arms on said levers connected together bymeans of a rod pivoted thereto, With centrifugally operating Weights andcentripetally-acting springs connected directly to the free ends of saidlevers, substantially as and for the purpose set forth.

4. The combination, in a steam-engine governor, of tWo pendulum-levers,one of which supports a Wrist-pin or eccentric for driving aneccentric-rod, connected together so that the movements of said leversare synchronous, and centrifugally-operating weights secured to the freeends of said levers, with centripetally-operating springs, each of whichis conneeted to the free end of one of said levers, so as to actinopposition to the centrifugallyoperating weight thereon, by lneans of arod passing through a slotted opening in the lever opposite to the oneto which it is secured, and stops on said rods limiting the outwardmovements of said levers,substantially as and for the purpose set forth.

In testimony whereof I affix my sgnaturein presence of two Witnesses.

EDWARD L. MILLS. Witnesses:

C. OBRIEN, JOHN S. BILLING.

